Rear disc mot failure

[bwizz]

Hi never heard of them either .in my case without heat nothing will shift the remaining studds.  I had a allen head tool with a half inch ratchet when the innards ripped out
so to say the least they are very tight, I have a feeling that the bolts were put in with thread lock , as they are still megga tight even without the disc in situ, options i think are either a special  hardened drill bit to drill and tap. or lots more heat, with the risk that the casting collapses